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Presentation
Determination of Plate Source, Detector Separation from One Signal
(1999)
  • Stephen D. Holland, Cornell University
  • Tadej Kosel, University of Ljubljana
  • Richard Weaver, University of Illinois at Urbana-Champaign
  • Wolfgang Sachse, Cornell University
Abstract

We address the problem of locating a transient source, such as an acoustic emission source, in a plate. We apply time-frequency analysis to the signals detected at a receiver. These highly dispersive and complex waveforms are measured for source-receiver separations ranging from 40 to 180 plate thicknesses and at frequencies such that ten to twenty Rayleigh-Lamb branches are included. Re-assigned, smoothed, pseudo-Wigner-Ville distributions are generated that exhibit the expected sharp ridges in the time-frequency plane, lying along the predicted frequency-time-of-arrival relations. The source-receiver separation can be determined from such plots.

Keywords
  • Time-frequency analysis,
  • acoustic emission,
  • source location,
  • Wigner-Ville distribution,
  • spectrogram,
  • source-detector separation,
  • plate modes,
  • wave dispersion,
  • ultrasound
Publication Date
November 30, 1999
Comments
This is a post-print of a proceeding published in Ultrasonics 38 (2000): 620–623, doi:10.1016/S0041-624X(99)00206-1. Copyright 2000 Elsevier B.V.
Citation Information
Stephen D. Holland, Tadej Kosel, Richard Weaver and Wolfgang Sachse. "Determination of Plate Source, Detector Separation from One Signal" (1999)
Available at: http://works.bepress.com/stephen_holland/43/